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  思考
</a></div> <!----></nav>  <ul class="sidebar-links"><li><a href="/resume/" aria-current="page" class="sidebar-link">我要写简历</a></li><li><a href="/resume/zhangqiuyi.html" class="sidebar-link">张秋怡-优秀简历</a></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="肖开元"><a href="#肖开元" class="header-anchor">#</a> 肖开元</h1> <p>被问期望薪资
说一个固定的值，然后反问面试官：公司应该有相对比较成熟的薪酬服务制度吧，能不能给介绍一下呢？</p> <h2 id="新奥"><a href="#新奥" class="header-anchor">#</a> 新奥</h2> <p>2021年4月28日</p> <ul><li>在公司的主要职责</li> <li>如何做技术选型</li> <li><a href="http://www.ruanyifeng.com/blog/2014/03/undefined-vs-null.html" target="_blank" rel="noopener noreferrer">null和undefined的区别<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li> <li>本地存储区别（localStorage、sessionStorage、Cookie）</li> <li>安全及防御（xss、rcsf）</li> <li>性能优化</li></ul> <h2 id="待整理"><a href="#待整理" class="header-anchor">#</a> 待整理</h2> <p>CSS选择器及优先级：!important(最大) &gt; style(1000) &gt; id(100) &gt; class(10) &gt; 元素(1) &gt; 通配(0)
正则表达式：？
dom指定节点前面插入div--&gt;before与after来自原生还是库
对数据可视化的理解
行内元素与块级元素的区别
水平垂直居中的方法
两列布局
如何给数组增加数据项
==和===的区别
CSS 盒子模型(Box Model)
VueRouter的hash和history的区别（优缺点）
v-if和v-show区别
for 和for in 的区别
js阻止默认事件
flex布局 ------如何实现水平垂直居中</p> <p>一个阶梯的算法题，共有N个台阶，每步可以上1个、2个或3个台阶，问一共有多少种方法可以上到N个台阶。</p> <h2 id="人人网"><a href="#人人网" class="header-anchor">#</a> 人人网</h2> <ol><li>手写一个 aaabbbccdeee，变为 a3b3c2de3</li> <li>对 HTML5 新特性有什么了解吗</li> <li>对 dom 队列的了解</li> <li>对 flex 属性有了解吗，flex 的作用是什么，作用于子元素的属性有那些</li> <li>说说闭包，说说什么是宿主</li> <li>用过 map 吗，我以为是 map 方法，map 和 array 区别，map 解决了什么问题有什么好处</li> <li>Websokt 的 api，怎么实现和交互的</li> <li>diff 是广度优先还是深度优先</li></ol> <h2 id="小米"><a href="#小米" class="header-anchor">#</a> 小米</h2> <ul><li>px em rem vw vh 的区别，后面两个没用过</li> <li>width: 1px 在手机上的物理像素是多少</li> <li>BFC:</li> <li>transform 有用过吗，transform：translate(100px) rotate(45deg) 执行顺序？从左到右执行</li> <li>虚拟 dom 原理，为什么现在的框架都要使用虚拟 dom</li> <li>vue <code>&lt;div&gt;&lt;/div&gt;</code> 与 <code>&lt;div&gt;1&lt;/div&gt;</code>，执行效率，当只有一个1变为2的时候，虚拟dom真的比实际修改更快吗</li> <li>数据响应式原理，defineproperty是对对象的，那么对数组怎么实现</li> <li>事件循环机制</li> <li>闭包，闭包有哪些应用</li> <li>异步组件，实现原理，我看的面经说是 webpack 分包，他写出来是 懒加载 () =&gt; import()</li> <li>懒加载的原理</li> <li>组件传值，就只问 父传子，除了 props 和 vuex，还答了 refs(面试官觉得这个方法很新颖，但是真的能传吗)</li> <li>$emit 的原理，怎么实现</li> <li>vue-router的hash 和history，及原生的api</li> <li>说深拷贝和浅拷贝，手写深拷贝</li> <li>es6 数组新增方法有哪些？我当时只想到 map，他说 reduce 了解吗，没有，手写 map</li> <li>promise.race 和 all，区别说的肯定对，当有一个是 reject 的时候，走 then 还是 catch，感觉有坑</li> <li>手写 promise.all</li> <li>最后一个简单的有序数组，很简单的题也没答好，还有没有时间还是空间复杂度更低的？</li> <li>最后，问我还有什么想了解的吗</li></ul> <h2 id="字节"><a href="#字节" class="header-anchor">#</a> 字节</h2> <h3 id="_1-websocket-性能提升怎么做的-c端做过哪些新能提升-白屏时间指的是-哪个阶段的时间"><a href="#_1-websocket-性能提升怎么做的-c端做过哪些新能提升-白屏时间指的是-哪个阶段的时间" class="header-anchor">#</a> 1-websocket 性能提升怎么做的，c端做过哪些新能提升，白屏时间指的是，哪个阶段的时间</h3> <h3 id="_2-xxs-攻击-怎么攻击的-原理-有哪些-inntext-和innhtml"><a href="#_2-xxs-攻击-怎么攻击的-原理-有哪些-inntext-和innhtml" class="header-anchor">#</a> 2-xxs 攻击，怎么攻击的，原理，有哪些，inntext 和innhtml</h3> <h3 id="_3-数组的最大深度"><a href="#_3-数组的最大深度" class="header-anchor">#</a> 3. 数组的最大深度</h3> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token comment">// 获取数组的最大深度</span>
<span class="token keyword">const</span> arr <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token number">3</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token number">5</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token number">6</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token number">7</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token number">8</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token number">9</span><span class="token punctuation">]</span><span class="token punctuation">;</span>

<span class="token keyword">function</span> <span class="token function">getMaxArrayDepth</span><span class="token punctuation">(</span><span class="token parameter">arr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">let</span> depth <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> <span class="token comment">// 记录数组深度</span>
    
    <span class="token keyword">function</span> <span class="token function">setDepth</span> <span class="token punctuation">(</span><span class="token parameter">newArr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token comment">// 不是数组，则返回</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token operator">!</span>Array<span class="token punctuation">.</span><span class="token function">isArray</span><span class="token punctuation">(</span>newArr<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">return</span><span class="token punctuation">;</span>
        
        <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token operator">!</span>Array<span class="token punctuation">.</span><span class="token function">isArray</span><span class="token punctuation">(</span>newArr<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">return</span><span class="token punctuation">;</span>

        <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> i<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>i<span class="token operator">&lt;</span> newArr<span class="token punctuation">.</span>length<span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token function">setDepth</span><span class="token punctuation">(</span>newArr<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
    <span class="token function">setDepth</span><span class="token punctuation">(</span>arr<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> depth<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">const</span> depth <span class="token operator">=</span> <span class="token function">getMaxArrayDepth</span><span class="token punctuation">(</span>arr<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>depth<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h2 id="字节-另一部门"><a href="#字节-另一部门" class="header-anchor">#</a> 字节 - 另一部门</h2> <ul><li><p>websocket 代替 jq 轮询，怎么性能提升，
提升的是前端还是后端，
ws和http区别，http也可以做长连接，为什么不用，我当时说了没有了解过http做长连接
http和https 为什么就安全了呢，公钥不也明文传输吗，不安全啊</p> <ul><li>c端的性能会关注哪些方面：首页加载白屏时间</li></ul></li> <li><p>[innerHTML]=&quot;contentHtml&quot; 引起的 xss 攻击，怎么攻击的，原理，有哪些，inntext 和innhtml，ASC什么什么（叫 ASCII）</p></li></ul> <div class="language- extra-class"><pre class="language-text"><code>innerText='&lt;script&gt;alert(1)&lt;/script&gt;' 会执行吗？，不会，被当成字符串解析了
</code></pre></div><ul><li>Foo</li> <li>getMaxArrayDepth</li></ul> <h2 id="新奥数能"><a href="#新奥数能" class="header-anchor">#</a> 新奥数能</h2> <p>ts 中 interface 怎么继承 type，他们的区别（xx）</p> <p>obj2怎么继承obj1的部分属性（这里涉及一个高级概念-泛型约束）</p> <p>泛型</p> <p>vue 中 hash 怎么实现跳转的（平时只注意两种模式了）</p> <p>长链接除了 websockt 还有哪些，</p> <p>http1 和 http2 区别（这个是最失败的）</p> <p>keep-alive 如果想更新组件怎么办（没说上来，但是他告诉我提供了两个勾子），我说用组件懒加载（我想了wacth路由但是组件不涉及路由，页面还好说）</p> <p>浏览器中一个老项目，突然有一天白屏了，没有报错，你第一反应会怎么查</p> <h2 id="龙湖"><a href="#龙湖" class="header-anchor">#</a> 龙湖</h2> <ul><li><p>自我介绍</p> <ol><li>我今天补充说了，公司的技术从 jsp 到 angular 到 vue 一个发展过程</li> <li>说完面试官说还有呢？我感觉他简历还没看是咋回事，然后有了下面两个问题</li></ol></li> <li><p>说一下你在原公司的主要职责</p> <ol><li>猎头夸大其词了，认为我是架构师</li> <li>收集客户需求，制作一个功能齐全的基础项目，分发到各事业部做二次开发，会写一些文档或培训</li></ol></li> <li><p>怎么做技术选型</p> <ol><li>猎头夸大其词了，认为我是架构师</li> <li>既然问了，就瞎编呗，1-考虑公司人员的上手学习成本，比如之前 angular 需要学 ts，难度大，2-考虑用户。。。（这里答失败，跟用户什么关系）</li></ol></li> <li><p>说一下 vue 路由</p> <ol><li>真不熟悉这种问法，他想知道什么？</li> <li>说了单页应用，前端接管路由</li> <li>路由的两种模式，hash 和 history</li> <li>他问了，有什么优缺点，有点懵，我感觉我已经说过了啊，说了#不美观，和微信授权有点冲突（他应该不太了解，其实我也不太明白），但不需要 nginx 配置</li></ol></li> <li><p>说一下 v-if 和 v-show</p> <ol><li>习惯性的说了 display-none，瞬间反应过来应该先说 if，if 的话就是根据条件判断该节点是否存在，而 show 是该节点已经存在类似 display-none/block 隐藏、显示</li> <li>他说，好的，明白，估计是太简单了吧</li></ol></li> <li><p>null 和 undefined 的区别</p> <ol><li>他说问个最简单的问题</li> <li>蒙了，什么区别？如果定义一个变量没有赋值的话会是 undefined，如果该变量不存在的话是 null，（回答失败）</li></ol></li> <li><p>说一下本地存储及区别</p> <ol><li>我们平时用的比较多的是，localStorage、cookie，（我有停顿，他抢话了，我没有说 sessionStorage 感觉坑了）</li> <li>说一下 cookie 和 localStorage 区别，cookie 存储比较小（当时不知道怎么形容了），并且有过期时间限制，localStorage 是长时间储存（应该是持久化，直达用户主动清除）</li> <li>有用过 sessionStorage 吗，有用到过的，会在浏览器关闭消失（会话关闭），不过至少说对了，（当时还想着关闭浏览器关闭不是 cookie 吧）</li></ol></li> <li><p>有了解安全及防御</p> <ol><li>（不应该说这句）工作中用的比较少，但是平时学习有了解过</li> <li>xss （稍微想了一下怕说错）跨站脚本攻击，反射型、注入型、基于 DOM，（注入型说的迷迷糊糊，防御也忘记说了，应该是 表达校验，后端校验）</li> <li>rcsf（没说对字母），请求伪造，第三方截取请求注入不安全脚本（不会说了），防御主要 https 和 token</li></ol></li> <li><p>说一下性能优化</p> <ol><li>平时会做一些比如首屏渲染时间（应该是缩短首屏加载时间），然后使用 cdn，js 和 css 压缩，css 减少嵌套，html 也是减少 div 嵌套，多使用语义化标签，css 放 head，js 放 body 之前，vue 里面会采用像路由懒加载，组件懒加载等</li> <li>面试官可能觉得很浅</li></ol></li> <li><p>最后还有什么想问的吗</p> <ol><li>我感觉啥也没问怎么就结束了，我第一反应想问还有问题吗</li> <li>问了你们招聘的岗位是什么级别的，（都猜到他能说什么，等于白问）看情况，有高级别的，也有普通岗</li> <li>你们前端主要负责那一块的项目，（想起来之前看的视频，了解一下面试和简历是不是有误解，及时纠正），然后他说主要是 PC，看你简历有做过 app，我们 app 可能不太涉及</li> <li>人家不太涉及，我能说什么</li></ol></li></ul> <h2 id="不知名公司-电话面试"><a href="#不知名公司-电话面试" class="header-anchor">#</a> 不知名公司-电话面试</h2> <ol><li><p>如何对象、定义类、子类</p></li> <li><p>原型继承和覆盖继承，区别</p></li> <li><p>说出你知道的 ES6 方法/新特性</p> <div class="language-text extra-class"><pre class="language-text"><code>// 说出的，忘了最基础的 const let
promise
Map Set
Math.max
async/await
// 其他
const let 模板字符串 解构赋值 模块导入导出 类
promise proxy definpropty Map Set includes async/await
</code></pre></div></li> <li><p>const 不可改变，数据类型的不可改变？</p> <div class="language-text extra-class"><pre class="language-text"><code>// 他问这个的时候，我知道他想问数据的存储，答了引用类型和基本类型
obj属性是可变的，指针是不可变的
</code></pre></div></li> <li><p>模板方法模式</p> <p>我答的是类似 vue 的 template，他说不是一回事，就直接说不知道了</p></li> <li><p>函数式编程</p> <div class="language-text extra-class"><pre class="language-text"><code>相对于命令式编程，讲究编写顺序和执行顺序
函数式编程主要以函数为主
问了用过函数式编程框架？
</code></pre></div></li> <li><p>Vue 父子组件通信</p> <div class="language-text extra-class"><pre class="language-text"><code>// 父子组件通信方式大概有六种
// 补充
props/$emit
$emit/$on  通过一个空的Vue实例作为中央事件总线  Event.$emit Event.$on
vuex/localstroge
$attrs/$listeners
provide/inject  /prəˈvaɪd/  祖先组件中通过provider来提供变量，然后在子孙组件中通过inject来注入变量
$parent / $children与 ref
</code></pre></div></li> <li><p>闭包及闭包的例子</p> <div class="language-text extra-class"><pre class="language-text"><code>闭包的例子一般会说 ul-li的点击

// 其实防抖和节流都是闭包
</code></pre></div></li> <li><p>this 的几种应用场景</p></li> <li><p>bind 应用场景</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// 从对象里把某个方法单领出来用的时候，this会指向window</span>

<span class="token keyword">var</span> log <span class="token operator">=</span> console<span class="token punctuation">.</span>log<span class="token punctuation">;</span>
<span class="token function">log</span><span class="token punctuation">(</span><span class="token string">&quot;info&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token class-name">Function</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span>bind <span class="token operator">=</span>
  <span class="token class-name">Function</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span>bind <span class="token operator">||</span>
  <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">context</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">var</span> _this <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token function">_this</span><span class="token punctuation">.</span><span class="token function">apply</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> arguments<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre></div></li></ol> <h2 id="hulu-方正"><a href="#hulu-方正" class="header-anchor">#</a> hulu - 方正</h2> <p>2021-04-07</p> <p>hulu是美国的一个视频网站。该网站由美国国家广播环球公司（NBC Universal）和福克斯在2007年3月共同注册成立。</p> <p>顺顺提到他们用的是 FMP ，那么，FMP 又是什么？</p> <h3 id="内存优化"><a href="#内存优化" class="header-anchor">#</a> 内存优化</h3> <h3 id="fps-优化"><a href="#fps-优化" class="header-anchor">#</a> fps 优化</h3> <h3 id="首屏优化"><a href="#首屏优化" class="header-anchor">#</a> 首屏优化</h3> <h2 id="笔试题"><a href="#笔试题" class="header-anchor">#</a> 笔试题</h2> <h3 id="笔试-1-使用css实现一个箭头"><a href="#笔试-1-使用css实现一个箭头" class="header-anchor">#</a> 笔试：1. 使用css实现一个箭头</h3> <h3 id="笔试-2-简述一下vue的生命周期"><a href="#笔试-2-简述一下vue的生命周期" class="header-anchor">#</a> 笔试：2. 简述一下Vue的生命周期</h3> <h3 id="笔试-3-使用promise加载一个网络图片-如果失败-返回一张默认图片占位"><a href="#笔试-3-使用promise加载一个网络图片-如果失败-返回一张默认图片占位" class="header-anchor">#</a> 笔试：3. 使用promise加载一个网络图片，如果失败，返回一张默认图片占位</h3> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">loadImage</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">url<span class="token punctuation">,</span> defaultImg</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> image <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Image</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">Promise</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">resolve<span class="token punctuation">,</span> reject</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        images<span class="token punctuation">.</span>src <span class="token operator">=</span> url<span class="token punctuation">;</span>
        document<span class="token punctuation">.</span>body<span class="token punctuation">.</span><span class="token function">appendChild</span><span class="token punctuation">(</span>image<span class="token punctuation">)</span><span class="token punctuation">;</span>
        image<span class="token punctuation">.</span><span class="token function-variable function">onload</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
            <span class="token function">resolve</span><span class="token punctuation">(</span><span class="token string">'load images success'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        image<span class="token punctuation">.</span><span class="token function-variable function">onerror</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
            image<span class="token punctuation">.</span>src <span class="token operator">=</span> defaultImg<span class="token punctuation">;</span>
            <span class="token function">reject</span><span class="token punctuation">(</span><span class="token string">'load images success'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>

<span class="token function">loadImage</span><span class="token punctuation">(</span><span class="token string">&quot;&quot;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">res</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>res<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token parameter">error</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

<span class="token keyword">export</span> <span class="token keyword">default</span> loadImage<span class="token punctuation">;</span>
</code></pre></div><div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>loadImage</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">'</span><span class="token punctuation">'</span></span> <span class="token attr-name">data-src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">'</span><span class="token punctuation">'</span></span> <span class="token punctuation">/&gt;</span></span>
</code></pre></div><h3 id="笔试-4-反转字符串"><a href="#笔试-4-反转字符串" class="header-anchor">#</a> 笔试：4. 反转字符串</h3> <div class="language-javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token function-variable function">reverseStr</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">str</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> str<span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">''</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">reverse</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">''</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token function">reverseStr</span><span class="token punctuation">(</span><span class="token string">'abcdefg'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">更新时间:</span> <span class="time">3/25/2022, 7:13:26 PM</span></div></footer> <!----> </main></div><div class="global-ui"><!----></div></div>
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